/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.api.connector.source.mocks;

import org.apache.flink.api.connector.source.Boundedness;
import org.apache.flink.api.connector.source.Source;
import org.apache.flink.api.connector.source.SourceReader;
import org.apache.flink.api.connector.source.SourceReaderContext;
import org.apache.flink.api.connector.source.SplitEnumerator;
import org.apache.flink.api.connector.source.SplitEnumeratorContext;
import org.apache.flink.core.io.SimpleVersionedSerializer;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * A mock {@link Source} for unit tests.
 */
public class MockSource implements Source<Integer, MockSourceSplit, Set<MockSourceSplit>> {

	private static final long serialVersionUID = 1L;

	private final Boundedness boundedness;
	private final int numSplits;
	private final boolean readerWaitingForMoreSplits;
	private final boolean readerMarkIdleOnNoSplits;
	protected List<MockSourceReader> createdReaders;

	public MockSource(Boundedness boundedness, int numSplits) {
		this(boundedness, numSplits, false, false);
	}

	public MockSource(Boundedness boundedness, int numSplits, boolean readerWaitingForMoreSplits, boolean readerMarkIdleOnNoSplits) {
		this.boundedness = boundedness;
		this.numSplits = numSplits;
		this.createdReaders = new ArrayList<>();
		this.readerWaitingForMoreSplits = readerWaitingForMoreSplits;
		this.readerMarkIdleOnNoSplits = readerMarkIdleOnNoSplits;
	}

	@Override
	public Boundedness getBoundedness() {
		return boundedness;
	}

	@Override
	public SourceReader<Integer, MockSourceSplit> createReader(SourceReaderContext readerContext) {
		MockSourceReader mockSourceReader = new MockSourceReader(readerWaitingForMoreSplits, readerMarkIdleOnNoSplits);
		createdReaders.add(mockSourceReader);
		return mockSourceReader;
	}

	@Override
	public SplitEnumerator<MockSourceSplit, Set<MockSourceSplit>> createEnumerator(SplitEnumeratorContext<MockSourceSplit> enumContext) {
		return new MockSplitEnumerator(numSplits, enumContext);
	}

	@Override
	public SplitEnumerator<MockSourceSplit, Set<MockSourceSplit>> restoreEnumerator(
			SplitEnumeratorContext<MockSourceSplit> enumContext,
			Set<MockSourceSplit> checkpoint) throws IOException {
		return new MockSplitEnumerator(checkpoint, enumContext);
	}

	@Override
	public SimpleVersionedSerializer<MockSourceSplit> getSplitSerializer() {
		return new MockSourceSplitSerializer();
	}

	@Override
	public SimpleVersionedSerializer<Set<MockSourceSplit>> getEnumeratorCheckpointSerializer() {
		return new MockSplitEnumeratorCheckpointSerializer();
	}

	// --------------- methods for testing -------------

	public List<MockSourceReader> getCreatedReaders() {
		return createdReaders;
	}
}
